<!DOCTYPE html>
<html>
    <head>
	<meta charset="utf-8" />
		<title></title>
<!--[if lt IE 9]><!-->
    		<script src="http://code.jquery.com/jquery-1.11.3.min.js "></script>
<!--<![endif]-->
<!--[if gte IE 9]><!-->
			<script src="https://code.jquery.com/jquery-3.2.1.min.js "></script>
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	<script>
	$(document).ready(function(){
  $("p").mouseenter(function(){
    $("p").css("background-color","yellow");
  });
  $("p").mouseleave(function(){
    $("p").css("background-color","lightgray");
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</head>
<body>
 
<p>鼠标移动到该段落。</p>
 
</body>
</html>
